Detector for printing-presses or the like.



G. T. EAGAR. DETECTOR FOB PRINTING PRBSSES on THE LIKE.

APPLICATION FILED JULY5, 1912. v 1,077,31 8. Patented Nov. 4,1913.

INVENTUH GEDRGE 1 7 .EAEAH gwW -Z WW UNITED STATES PATENT ()FFICE.

GEORGE 1*. EAGAR, or new Yonx, N. Y., AssIGNon r0 ens-amt ntno'rmc company, A conronarrou or NEW YORK.

Dmo'ron ron rnmTme-rmissns on THE LIKE Specification 6f Letters Patent.

Patented Nov, 4,- 1913.

To all whom it may concern: I

' Be it known that I, GEORGE T. EAGAR, a citizenof the United States, residing at New York, county of New York, State of New York, have invepted certain new and useful Improvements 1n Detectors for Printing Presses or the like, of which the following is a specification.

This invention relates to the control of machines such as printingpr'esses and the like in which the stock is fed lnto the machine in a continuous web, and has for its object the provision of improved means whereby the operation of the machine will be automatically stopped upon the appear ance of imperfection in the stock.

In the operation of such machines as printing presses and the like it frequently happens that imperfections occur which it would be undesirable and in fact even don gerous to have pass into the machine. In the case of a printing press, for instance, the paper will sometimes become doubled or folded on itself so as to become too thick to safely pass through the press.

One of the objects of my invention is to provide means whereby upon the occurrence of such an imperfection the press will be automatically stopped.

A Other objects of my invention will appearin the course of the following specification in which I have shown my invention embodied in concrete form for purposes of illustration. r

In the accompanying drawing illustrating one embodiment of my invention Figure 1 is a diagrammatic view of apparatus embodying my invention and Fig. 2 is a perspective view of a portion thereof.

Referring to these drawings, M represents an electric motor for driving a printing press or the like and It represents the roller of the printing press over which the paper P travels.

Inasmuch as my device is applicable to any form of printing press or similar machine in which a continuous web of stock is fed into the machine, I have not attempted to show acomplete machine but merely certain elements thereof, namely, the roller and web 0 aper. J

The circuit of the motor M is controlled by an electromagnetic switch or contactor 10 avin'g an energizin winding 11. This contactor is opened an closed to start and stop the motor in a well known manner and hence start and stop the machine.

My improved device forstopping the machine on the occurrence of an imperfection in the stock consists of members 12 pivoted at 13 carrying a roller 14 which is adapted to engage the webof paper. The opposite end of the member 12 carries a contact 15 ada ted to bridge the contacts 16 when the re er 14 is in the position shown in the drawing, and t-obridge the contacts 17 when the roller is out of engagement with the paper. The member 12 is biased to a position in which the roller 14 is out of engagement with the paper in any desired manner, as, for instance, b means of a weight 18 on the rod 19. With this arrangement the weight will normally keep the roller 14 out of engagement with the paper and the contact 15 in engagement with the contacts 17. In order to hold the roller 14 in engagement with the paper I provide a ma net 20 which is preferably a permanent -shaped magnet, for holding the member 12. The ma net 20 cooperates with an armature 21 W ich is adjustably mounted on the arm 12 by means of a spring 22 and adjusting nut 23. By turning the nut back and forth the armature 21 can be adjusted and hence the position of the roller 14 and the contact 15. The contacts 16 and 17 are in the circuit of the windin 11 and are in parallel, as shown, so that eit er of the contacts 16 and 17 must be bridged before the winding 11 can be energized. The switch 24, whichis shown as a normally open pushbutton, is arranged to complete the circuit of the winding 11 and the normally closed pushbutton 25 is provided for opening the circuit of the winding 11'. Interlocking disk 26 is arranged to bridge the contacts 27 to short circuit the switch 24 when the contactor '10 is in closed position.

As thus constructed and arranged the op eration of my device is as follows: iVlth the parts in the position shown in the drawing, in which the roller 14 is held in en gagement with the paper by the magnet and the contacts 16 bridged, the motor w11l be started by closing the switch 24. This 10 closes the switch 24 is short circuited by the interlocking disk 26 so that the switch 24 may be released without opening the contactor. If at any time as the web of stock a P passes under the roller 14 an imperfection should occur the roller 14 will be lifted and if the imperfection is sufiicient to warrant it, the attraction of the magnet 20 will be overcome, whereupon the weight 18 will move the arm 12 until the contact 15 bridges the contacts 17. Just as soon as the cont-act 15 leaves the contact 16 the winding 11 of the contactor 10 will be deenergized and the contactor opened, thereby stopping the motor. When the contact 15 bridges the contact 17 the motor can be again started by closing the. switch 24. This is desirable, as. it may be necessary to feed the stock along to removethe imperfection. The parts may again be set in normal operation by bring ing the roller 14 down into engagement with the paper, where it will be held as before by the magnet 20. The motor can be stopped at any time by. means of the switch 25.

It will be seen that I have provided a' sim-;

ple and eflective device foriinstantly stopping the motor upon the occurrenceofjan'f imperfection'in the stock, and while 'I havei described the same as embodiedin concrete form and as operating in a specific manner in accordance with the patent statutes, it should be understood that I do not limit my invention thereto since various modifications thereof will suggest themselves to those skilled in the art without departing from the spirit of my invention, the scope of which is set forth in the annexed claims.

lVhat I claim as new and desire. to secure by Letters Patent of the United States, is:

1. A detector for printing presses or the like comprising a movable member extending throughout the width of the paper and normally out of engagement therewith, a magnet for holding the member in engagement with the paper until overcome by the pull caused by an imperfection in the paper, and a switch contact carried by said member.

2. A detector for printing presses or the like comprising a pivoted roller extending mally out of engagement therewith, a magnet for holding the roller in engagement with the paper until overcome by the pull caused by an imperfection in the paper, and a switch contact movable with said roller.

3. A detector for printing presses and the like comprising a pivoted member, a roller extending throughout the width of the paper mounted at one end of said member and normally out of engagement therewith, a magnet for holding the roller in engagement with the paper until overcome by the pull caused by an imperfection in the pa er, and a switch contact at the opposite en of the member.

4. A detector for printing presses or the like comprising a pivoted member having a roller at one end for engaging the paper and a cont-act at the other end, said member having an engaging position and a non-engaging position, and biased to the latter position, a magnet for holding the member in engaging position until overcome by the pull caused by an imperfection in the paper, and stationary contacts arranged to be engaged in each position by said moving contact.

5. The combination with a printing press or the like and a motor for driving the same, of a device for controlling the motor circuit comprising a movable member extending throughout the width of the paper and biased to a position out of engagement therewith, a magnet for holding the member against the bias in a position to engage the paper until overcome by the pull caused by an" imperfect-ion in the paper, and connectionsfWhereby the motor circuit may be closedfwiththe, member in either position aaawinbe opened when the member leaves eag g'in position.

6. The combination with a printing press or the like and a motor for driving the same, of a contactor for opening and closing the motor circuit and a device for controlling the circuit of said contactor comprising a movable member extending throughout the width of the paper and biased to a position out of engagement therewith, a ma net for holding the member against the blas in a position to engage the paper until overcome by the pull caused by imperfection in the paper, a switch controlling the energizing circuit of said contactor, and contacts in the energizing circuit of said contactor arranged to be closed in each position of said member.

7. The combination with a printing press or the like and a motor for driving the same, of a contactor for opening and closin the motor circuit and a device for contrdlling the circuit of said contactor comprising a throughout the width of the paper and nor-' pivoted member having a roller at one end for engaging the paper and a contact at the other end, said member having an engaging position and a non-engaging position and biased to the latter position, a magnet for holding the member in engaging position until overcome by the pull caused by an imperfection in the paper, a switch controlling the energizing circuit of said contactor,

10 and contacts in the energizing circuit of Said contactor arranged to be closed by said movable contact in each posit-ion of said member.

In witness whereof, I have hereunto set my hand this second day of July, 1912.

GEORGE T. EAGAR.

Witnesses:

H. F. Coscnovn, HENRY G. ISSERTELL. 

